It's obviously not urgent they would have called us right away.
#31918
A
but
B
or
C
so
D
for
推荐题目
I had just taken a bite of my hot dog ________ I heard a familiar voice yelling at me from across the crowded school yard.
#32136
A
before
B
while
C
since
D
when
--With the country’s pension fund gap becoming wider than ever, retirement age should be postponed immediately. ---Easier said than done. we take all factors into account, we shall be faced with some other social problems.
#30736
A
Unless
B
Until
C
When
D
Once
English is understood all over the world ________ Turkey is spoken by only a few people outside Turkey itself.
#79869
A
while
B
because
C
unless
D
as
_______ he has made a decision, it is not easy for you to make him change his mind.
#31574
A
Though
B
Unless
C
Once
D
Until
Air pollution is getting more and more serious, so we must take action ________ it is too late.
#30412
A
before
B
after
C
until
D
when